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Hi guys

I have just had a 2.5 inch exhaust installed on my r33 gtst.It is straight through to turbo no cat converters.It looks and sounds allright.What i am wondering is how safe and supose is it big enough to up the boost to say 12 psi.Mind you that appart from the exhaust i have a pod, front mount and a boost controller.Any help would be great

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